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Parameter measurement method for WCDMA system co-channel multi-cell downlink

A parameter measurement, multi-cell technology, applied in the field of parameter measurement, can solve problems such as large frequency deviation

Inactive Publication Date: 2012-09-05
广州钟鼎木林网络技术有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of multiple cells with the same frequency, there is a large frequency deviation between the downlink receiver and the base station and between the base station and the base station. According to the standard, the maximum frequency deviation can reach ±200Hz. In this case, the existing PCPICH channel Ec The / Io measurement method cannot accurately measure

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  • Parameter measurement method for WCDMA system co-channel multi-cell downlink
  • Parameter measurement method for WCDMA system co-channel multi-cell downlink
  • Parameter measurement method for WCDMA system co-channel multi-cell downlink

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with drawings and embodiments.

[0038] Such as figure 2 As shown, the parameter measurement method for the downlink of multiple cells of the same frequency in the WCDMA system includes the following steps:

[0039] Step 1: Cycle the following process sequentially for the set to be measured, cycle factor i=1~N, N is the number of elements in the set to be measured, and obtain Ec, i and Io, i in turn:

[0040] (1) The data sent by the WCDMA base station on PCPICH is the product of its scrambling code SC and +1 / -1. The scrambling code SC takes a frame as a cycle. After descrambling by the descrambling module, the PCPICH carries the frequency of For the single-tone signal with frequency deviation, use the i-th element of the set to be measured to generate the corresponding scrambling code SC, and descramble a frame of data to obtain Dsc, i=;

[0041] (2) In the accumulation module according to the wind...

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Abstract

The invention discloses a downlink parameter measuring method used for common frequency multi-cell of a WCDMA system. The method comprises the following steps: sets to be measured are circled in sequence; the cyclic factor I is equal to 1 to N, N is the number of elements of sets to be measured and Ec, i and Io and i are obtained in sequence; and Ec, j / Io are calculated according to the obtained Ec, i and Io and i. The method overcomes the defect that the traditional parameter measuring method of the PCPICH channel can not be used for larger frequency deviation environment, utilizes fast Fourier transform to transform the descrambled data to frequency domain, carries out parameter measurement of Ec / Io of the PCPICH accurately and effectively and overcomes the defect of occurrence of errors of time frequency accumulated results caused by accumulated phase deviation under the condition of large frequency deviation.

Description

technical field [0001] The invention relates to a parameter measurement method, in particular to a parameter measurement method for the downlink of multiple cells of the same frequency in a WCDMA system. Background technique [0002] In a mobile communication system, after synchronization, the user equipment needs to measure the Ec / Io of the PCPICH channel of the cell it is currently camping on. Ec represents the chip energy of the PCPICH channel, and Io represents the total power spectral density of the signal at the receiving end. [0003] The downlink common pilot channel PCPICH is composed of a long code (long code) with a period of 38400 chips. long code passed figure 1 The M sequence generated by two 18-stage shift registers constitutes a truncated GOLD sequence. [0004] According to the characteristics of the above PCPICH channel, the existing PCPICH channel Ec / Io measurement method is as follows: [0005] Step 1. Align and correlate a frame of data with a scramb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B1/7075
Inventor 施英
Owner 广州钟鼎木林网络技术有限公司